Eppleston J, Windsor P A
Central Tablelands Rural Lands Protection Board, Bathurst NSW 2795, Australia.
Aust Vet J. 2007 Apr;85(4):129-33. doi: 10.1111/j.0005-0423.2007.00135.x.
To determine i) the prevalence of lesions at the site of vaccination with Gudair, and ii) the incidence of discounting of slaughtered sheep carcasses due to the presence of these lesions.
A survey of the prevalence of injection lesions and actual discounts applied to 20 consignments of vaccinates slaughtered in abattoirs in New South Wales.
Consignments of sheep previously vaccinated against ovine Johne's disease (OJD) were assessed on the slaughter chain for the prevalence of vaccination site lesions and any costs associated with carcass trimming were estimated. In addition a telephone survey was conducted to determine the experiences and risk attitudes of 8 abattoirs in south east New South Wales likely to have previously processed vaccinates.
The prevalence of lesions observed was 18% for adult (mutton) and 65% for lamb carcasses. The value of the trim removed was insignificant, the labour cost of its removal was nil and no carcass was downgraded to a lower value grade.
Under the market conditions existing at the time the study was conducted, in sheep vaccinated at the recommended site high on the neck, it is unlikely that OJD vaccination site lesions will be a significant cost to producers or the processing industry and will represent only a very small proportion of the total cost of OJD control by vaccination.
确定i）使用古德艾尔（Gudair）疫苗接种部位的病变发生率，以及ii）由于这些病变导致屠宰羊胴体被打折处理的发生率。
对新南威尔士州各屠宰场宰杀的20批接种疫苗的羊只的注射部位病变发生率及实际打折情况进行调查。
在屠宰链上对先前接种过羊约翰氏病（OJD）疫苗的羊只进行评估，以确定疫苗接种部位病变的发生率，并估算与胴体修整相关的任何成本。此外，还进行了电话调查，以了解新南威尔士州东南部8家可能曾处理过接种疫苗羊只的屠宰场的经验和风险态度。
观察到的成年（羊肉）胴体病变发生率为18%，羔羊胴体为65%。修整去除部分的价值微不足道，去除其的人工成本为零，且没有胴体被降级到较低价值等级。
在开展本研究时的市场条件下，对于在颈部较高推荐部位接种疫苗的羊只，OJD疫苗接种部位病变不太可能给生产者或加工业带来重大成本，且在通过接种疫苗控制OJD的总成本中仅占极小比例。
